Benign beat me to it - we are the bisexuals of bdsm! Ever accused of not knowing who/what we want because we dont conform to some stereotype. I suspect the criticisms come from being able to have cake and eat it, whilst others restrict themselves to either ownership of baked wares or consumption thereof!
In bisexuality, it doesnt really matter which sex we come from - we like male and female, sometimes equally, usually in different proportions according to time, place, person etc. Its the same with being switch (IMHO), sometimes I want one, sometimes the other, sometimes both, according to the same criteria. If I'm bisexual female, it doesnt mean I'm a repressed lesbian just as much as it doesnt mean I'm a repressed heterosexual. If I'm switch, it doesnt mean I'm a repressed domme just as it doesnt mean I'm a repressed sub.
In some ways I think its a bit like guys who temporarily transgender themselves. They like both gender expressions is all it means, it doesnt mean they become female even though they leave their male self behind for a while, and it doesnt mean they have to choose between sex reassignment or extreme masculinity in order that others can stick a label on them.
I think the root of the problem is the dualistic nature of our society, which does not allow any grey areas - you are one thing or the other. The shame about this approach though is that it totally misses that there are no grey areas - just a whole rainbow of colours in a spectrum on which all stand. Some of us have more colours, thats all.